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Continuum and Molecular Dynamics Studies of the Hydrodynamics of Colloids Straddling a Fluid Interface
Annual Review of Fluid Mechanics ( IF 27.7 ) Pub Date : 2022-01-05 , DOI: 10.1146/annurev-fluid-032621-043917
Charles Maldarelli 1 , Nicole T. Donovan 1 , Subramaniam Chembai Ganesh 1 , Subhabrata Das 2 , Joel Koplik 3
Affiliation  

Colloid-sized particles (10 nm–10 μm in characteristic size) adsorb onto fluid interfaces, where they minimize their interfacial energy by straddling the surface, immersing themselves partly in each phase bounding the interface. The energy minimum achieved by relocation to the surface can be orders of magnitude greater than the thermal energy, effectively trapping the particles into monolayers, allowing them freedom only to translate and rotate along the surface. Particles adsorbed at interfaces are models for the understanding of the dynamics and assembly of particles in two dimensions and have broad technological applications, importantly in foam and emulsion science and in the bottom-up fabrication of new materials based on their monolayer assemblies. In this review, the hydrodynamics of the colloid motion along the surface is examined from both continuum and molecular dynamics frameworks. The interfacial energies of adsorbed particles is discussed first, followed by the hydrodynamics, starting with isolated particles followed by pairwise and multiple particle interactions. The effect of particle shape is emphasized, and the role played by the immersion depth and the surface rheology is discussed; experiments illustrating the applicability of the hydrodynamic studies are also examined.

中文翻译:


跨流体界面的胶体流体动力学的连续介质和分子动力学研究

胶体大小的颗粒(特征尺寸为 10 nm-10 μm)吸附在流体界面上,在那里它们通过跨越表面来最小化它们的界面能,将它们自己部分地浸入界面的每个相中。通过重新定位到表面所达到的最小能量可以比热能大几个数量级,有效地将粒子捕获到单层中,使它们只能自由地沿表面平移和旋转。吸附在界面上的粒子是理解粒子动力学和二维组装的模型,具有广泛的技术应用,在泡沫和乳液科学以及基于单层组装的新材料的自下而上制造中具有重要意义。在这次审查中,从连续介质和分子动力学框架中检查沿表面的胶体运动的流体动力学。首先讨论吸附粒子的界面能,然后是流体动力学,从孤立粒子开始,然后是成对和多粒子相互作用。强调了颗粒形状的影响,讨论了浸入深度和表面流变所起的作用;还检验了说明流体动力学研究适用性的实验。并讨论了浸入深度和表面流变所起的作用;还检验了说明流体动力学研究适用性的实验。并讨论了浸入深度和表面流变所起的作用;还检验了说明流体动力学研究适用性的实验。

更新日期:2022-01-06
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